21400583 has 2 divisors, whose sum is σ = 21400584. Its totient is φ = 21400582.

The previous prime is 21400523. The next prime is 21400591. The reversal of 21400583 is 38500412.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21400583 - 2¹⁰ = 21399559 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21400523) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10700291 + 10700292.

It is an arithmetic number, because the mean of its divisors is an integer number (10700292).

Almost surely, 2^21400583 is an apocalyptic number.

21400583 is a deficient number, since it is larger than the sum of its proper divisors (1).

21400583 is an equidigital number, since it uses as much as digits as its factorization.

21400583 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 960, while the sum is 23.

The square root of 21400583 is about 4626.0764152789. The cubic root of 21400583 is about 277.6356310171.

Adding to 21400583 its reverse (38500412), we get a palindrome (59900995).

The spelling of 21400583 in words is "twenty-one million, four hundred thousand, five hundred eighty-three".